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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: VersionPartComparator.html 689 2013-06-28 19:22:16Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.string;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.math.BigInteger;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.Comparator;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>/**<a name="line.13"></a>
<span class="sourceLineNo">014</span> * Comparator for version number parts.<a name="line.14"></a>
<span class="sourceLineNo">015</span> *<a name="line.15"></a>
<span class="sourceLineNo">016</span> * &lt;p&gt;<a name="line.16"></a>
<span class="sourceLineNo">017</span> * This comparator puts numerical parts before non-numerical parts.<a name="line.17"></a>
<span class="sourceLineNo">018</span> * Then, numerical parts are compared numerically, and non-numerical parts are compared lexically.<a name="line.18"></a>
<span class="sourceLineNo">019</span> * &lt;/p&gt;<a name="line.19"></a>
<span class="sourceLineNo">020</span> *<a name="line.20"></a>
<span class="sourceLineNo">021</span> * @see VersionComparator<a name="line.21"></a>
<span class="sourceLineNo">022</span> */<a name="line.22"></a>
<span class="sourceLineNo">023</span>public class VersionPartComparator implements Comparator&lt;String&gt; {<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    @Override<a name="line.25"></a>
<span class="sourceLineNo">026</span>    public int compare(String part1, String part2) {<a name="line.26"></a>
<span class="sourceLineNo">027</span>        BigInteger num1 = part1.matches("[0-9]+") ? new BigInteger(part1, 10) : null;<a name="line.27"></a>
<span class="sourceLineNo">028</span>        BigInteger num2 = part2.matches("[0-9]+") ? new BigInteger(part2, 10) : null;<a name="line.28"></a>
<span class="sourceLineNo">029</span>        if (num1 != null &amp;&amp; num2 != null)<a name="line.29"></a>
<span class="sourceLineNo">030</span>            return num1.compareTo(num2);<a name="line.30"></a>
<span class="sourceLineNo">031</span>        else if (num1 != null)<a name="line.31"></a>
<span class="sourceLineNo">032</span>            return 1;<a name="line.32"></a>
<span class="sourceLineNo">033</span>        else if (num2 != null)<a name="line.33"></a>
<span class="sourceLineNo">034</span>            return -1;<a name="line.34"></a>
<span class="sourceLineNo">035</span>        else<a name="line.35"></a>
<span class="sourceLineNo">036</span>            return part1.compareTo(part2);<a name="line.36"></a>
<span class="sourceLineNo">037</span>    }<a name="line.37"></a>
<span class="sourceLineNo">038</span>}<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>




























































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